package com.snsprj.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 *
 * [@Sharable]标示一个ChannelHandler可以被多个Channel安全地共享
 *
 * @author SKH
 * @date 2018-10-26 15:21
 **/
@Sharable
public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        ByteBuf in = (ByteBuf) msg;

        System.out.println("====>server received: " + in.toString(CharsetUtil.UTF_8));

        // 将接收到的消息写给发送者，而不冲刷出站消息
        ctx.write(in);
    }


    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {

        //  将未决消息冲刷到远程节点，并且关闭该Channel
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

        cause.printStackTrace();
        ctx.close();
    }
}
